Cry of the Carnarium — ruling 1

Cry of the Carnarium’s power-and-toughness-reducing effect affects only creatures on the battlefield at the time it resolves. Creatures that enter the battlefield later in the turn won’t get -2/-2.

Cry of the Carnarium — ruling 2

Cry of the Carnarium’s replacement effect affects any creature that would die in the turn, even creatures not on the battlefield as it resolves.

Cry of the Carnarium — ruling 3

Creatures that would die after getting -2/-2 will still be on the battlefield when cards are exiled from graveyards. They won’t die, and will instead be exiled after Cry of the Carnarium is entirely finished resolving.

Cry of the Carnarium : règles, fonctionnement et interactions (MTG)

Cry of the Carnarium is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

All creatures get -2/-2 until end of turn. Exile all creature cards in all graveyards that were put there from the battlefield this turn. If a creature would die this turn, exile it instead.

How it works : Cry of the Carnarium

Original English text — Wizards of the Coast / Scryfall

#1January 25, 2019· Wizards of the Coast
Cry of the Carnarium’s power-and-toughness-reducing effect affects only creatures on the battlefield at the time it resolves. Creatures that enter the battlefield later in the turn won’t get -2/-2.
No other card is named in this ruling.
#2January 25, 2019· Wizards of the Coast
Cry of the Carnarium’s replacement effect affects any creature that would die in the turn, even creatures not on the battlefield as it resolves.
No other card is named in this ruling.
#3January 25, 2019· Wizards of the Coast
Creatures that would die after getting -2/-2 will still be on the battlefield when cards are exiled from graveyards. They won’t die, and will instead be exiled after Cry of the Carnarium is entirely finished resolving.
No other card is named in this ruling.